Fitting and Comparing Galactic Foreground Models for Unbiased 21 cm Cosmology

Autor: Joshua J. Hibbard, David Rapetti, Jack O. Burns, Nivedita Mahesh, Neil Bassett

Publikováno v: The Astrophysical Journal, Vol 959, Iss 2, p 103 (2023)

Accurate detection of the cosmological 21 cm global signal requires galactic foreground models that can remove power over 10 ^6 . Although foreground and global signal models unavoidably exhibit overlap in their vector spaces inducing bias error in t

Externí odkaz: https://doaj.org/article/5e7b8bf96dd5495db6b3a00887509fe8

On the origin of diffuse radio emission in Abell 85 – insights from new GMRT observations

Autor: Majidul Rahaman, Ramij Raja, Abhirup Datta, Jack O Burns, David Rapetti

Publikováno v: Monthly Notices of the Royal Astronomical Society. 515:2245-2255

Extended, steep, and ultra-steep spectrum radio emission in a galaxy cluster is usually associated with recent mergers. Simulations show that radio phoenixes are aged radio galaxy lobes whose emission reactivates when a low Mach shock compresses it.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98ff0c84e4ec8cd56ca2a15d12e214cc
https://doi.org/10.1093/mnras/stac1892

Peering into the dark (ages) with low-frequency space interferometers Using the 21-cm signal of neutral hydrogen from the infant universe to probe fundamental (Astro)physics

Autor: Harish Vedantham, Daan Meerburg, Joseph Lazio, A. R. Offringa, Jonathan R. Pritchard, Rennan Barkana, Andrei Mesinger, Anastasia Fialkov, Abhirup Datta, Saleem Zaroubi, B. K. Gehlot, Heino Falcke, Léon V. E. Koopmans, Mark J. Bentum, Marc Klein-Wolt, Philippe Zarka, Jack O. Burns, Cathryn M. Trott, Licia Verde, Leonid I. Gurvits, Xuelei Chen, Florent Mertens, Ravi Subrahmanyan, Vibor Jelić, Judd D. Bowman, Gianni Bernardi, Garrelt Mellema, Albert-Jan Boonstra, B. Semelin, Joseph Silk

Publikováno v: Experimental Astronomy: an international journal on astronomical instrumentation and data analysis, 51(3)
Experimental Astronomy, 51, 1641-1676
Experimental Astronomy, 51, pp. 1641-1676

Neutral hydrogen pervades the infant Universe, and its redshifted 21-cm signal allows one to chart the Universe. This signal allows one to probe astrophysical processes such as the formation of the first stars, galaxies, (super)massive black holes an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::398bacd29ec9025a00b0199544320458
https://hdl.handle.net/2066/239805

Global 21-cm signal extraction from foreground and instrumental effects IV: Accounting for realistic instrument uncertainties and their overlap with foreground and signal models

Autor: Bang D. Nhan, Keith Tauscher, Richard F. Bradley, J. Hibbard, David Rapetti, Alec Handy, Jack O. Burns, David D. Bordenave, Neil Bassett

All 21-cm signal experiments rely on electronic receivers that affect the data via both multiplicative and additive biases through the receiver's gain and noise temperature. While experiments attempt to remove these biases, the residuals of their imp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c75c5e50533a59d2729257be723379ae
http://arxiv.org/abs/2105.01672

FARSIDE: A Low Radio Frequency Interferometric Array on the Lunar Farside

Autor: Robert J. MacDowall, Judd D. Bowman, David Rapetti, Justin C. Kasper, Jonathon Kocz, Steven R. Furlanetto, Wenbo Wu, Jack O. Burns, Zhongwen Zhan, Andrew Klesh, Jim Lux, James Tuttle Keane, Gregg Hallinan, Marin M. Anderson, Lawrence Teitelbaum, Andres Romero-Wolf, Alex Austin, Mark P. Panning, Tzu-Ching Chang, Richard F. Bradley, Issa A. D. Nesnas, Jonathan C. Pober

Publikováno v: Bulletin of the AAS. 53

FARSIDE (Farside Array for Radio Science Investigations of the Dark ages and Exoplanets) is a Probe-class concept to place a low radio frequency interferometric array on the farside of the Moon. A NASA-funded design study, focused on the instrument,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac0c28b4701dfbd4054a2f553dcbfbcd
https://doi.org/10.3847/25c2cfeb.60683360